Arimidex vs Aromasin
Arimidex vs Aromasin
Arimidex and Aromasin are compared here on the things that actually differ between them: what class each belongs to, what each acts on, how each is supplied and what each costs per milligram. Where the registry has no figure for one of them the row is left out rather than filled in.
Reference only. This page covers what the compound is, how it is presented and how it is handled. It does not give dosing protocols or administration schedules, and it is not medical advice.
Side by side
| Arimidex | Aromasin | |
|---|---|---|
| Class | Non-steroidal aromatase inhibitor | Steroidal (suicidal) aromatase inhibitor |
| Acts on | A reversible, competitive inhibitor of the aromatase enzyme, reducing conversion of androgens to oestrogens. | A steroidal aromatase inhibitor that binds the enzyme irreversibly, so activity returns only as new enzyme is synthesised. This distinguishes it from the reversible non-steroidal inhibitors. |
| Supplied as | Oral tablet. | Oral tablet. |
| Half-life | Approximately 50 hours. | Approximately 24 hours, though the irreversible mechanism outlasts the plasma half-life. |
| Storage | Cool, dry, dark. | Cool, dry, dark. |
| Listings | 1 | 1 |
| Price from | £25 | £35 |
What actually differs
The clearest difference is class: Arimidex is a Non-steroidal aromatase inhibitor, Aromasin is a steroidal (suicidal) aromatase inhibitor. Half-life differs as well: Approximately 50 hours for Arimidex against Approximately 24 hours, though the irreversible mechanism outlasts the plasma half-life for Aromasin.
Stocked at The PED Shop
Arimidex - Pharmain stock£25
Quanta Pharma Aromasinout of stock£35
Availability checked 2026-09-09. The product page carries live stock.